Ball screw specifications and models SFU1605

  Ball screws are ideal for converting rotary motion to linear motion or vice versa. Ball screw is the most commonly used transmission part in tool machinery and precision machinery. Its main function is to convert rotary motion into linear motion or torque into axial repetitive force with high precision, reversibility and high efficiency. Ball screws are widely used in various industrial equipment and precision instruments due to their small frictional resistance. Ball screw model and parameter table?

一：Ball screw specifications and models

1. Ball screw specifications and models

1. Determine the positioning accuracy

2. Determine the lead screw lead according to the motor and speed requirements

3. Check the nut size, determine the stroke and related data

4. Average axial force and degree distribution (acceleration and deceleration)

5. Determine the preload by the average axial force

二: Ball screw specification parameter table

1. Nominal diameter

is the outer diameter of the lead screw. The general specification is 12.14.16.20.25.32.40.50.63.80.100.120. However, please note that in these specifications, manufacturers usually only have 16~50 pieces of goods, that is, most other diameters are futures (order production, delivery time is about 30~60 days, Japanese products are about 2~2.5 months, European and American products The product is about 3~4 months).

The nominal diameter is basically proportional to the load. The larger the diameter, the greater the load. Please refer to the manufacturer's catalog for specific values. Only two concepts are described here: dynamic load rating and static load rating. The former refers to the rated axial load in motion, and the latter refers to the rated axial load in static state. The former can be used as design reference. It should be noted that the rated load is not the maximum load. The smaller the ratio of actual load to rated load, the longer the theoretical life of the screw. Suggestion: Try to choose a diameter of 16~63.

2. Leadership

Lead is the distance between the rotation of the screw and the linear movement of the nut. Ordinary lead (unit: mm): 2.4.5.6.8.10.16.20.25.32.40. The parameters related to the lead are the speed at which the nut moves and the linear thrust provided by the ball screw.

3. Length

There are two concepts of length, one is the total length and the other is the thread length. Some manufacturers only calculate the overall length, but others require the thread length. The thread length also has two parts, one part is the full length and the other part is the effective stroke. The former refers to the total length of the threaded part, while the latter refers to the maximum length of the nut linear motion theory and thread length = effective stroke + nut length + design margin (if the protective cover needs to be installed, the length of the compressed protective cover should also be considered, generally Calculated by 1/8 of the maximum length).